**4.2 Effect of different treatments on soil moisture**

286 Biogas

1 63.01 79.02 48.15 69.19 430.7 528 2 90.02 66.88 79.26 72.6 204.99 376.05 3 88.96 79.06 79.62 87.38 328.85 358.63 Mean 80.66 74.99 69.01 76.39 321.51 420.89

Source SS DF MS F P-value F0.05 Interval 9089.895 2 4544.947 1.290108 0.317365 4.1028 Treatment 365347.3 5 73069.46 20.74117 5.51E-05 3.3258

There were significant differences among the treatments, according to analysis of the

*<sup>i</sup> y Fi* − *yy Ei* − *yy Di* − *yy Ci* − *yy Bi* − *yy*

Notes: *<sup>i</sup> y* was mean of the *i* treatment; LSD0.05 and LSD0.01was significant at 0.05, not significant at 0.01.

The results showed that there were significant differences between three kinds of biogas residue fibre film, black film and plastic film, control; there were significant differences between three kinds of biogas residue fibre films and black film. Weed amount of A biogas residue fibre film decreased 81% as compared with control, and decreased 75% as compared with the plastic film; weed amount of B biogas residue fibre film decreased 82% as

A 80.66 340.23\*\* 240.85\*\* 4.27 11.65 5.67 108 154

Mean difference (g) LSD

0.05

LSD 0.01

A B C D E F

The measured results of total weeds of each treatment were shown in table 4-2.

Interval\Treatment Weed amount (g)

Table 4-2. The measured results of total weeds of each treatment

Analysis of variance of the weed amount was shown in table 4- 3.

Error 35229.19 10 3522.919

Table 4-3. Analysis of variance of the weed amount

multiple comparisons among treatments, seeing table 4-4.

C 69.01 351.88\*\* 252.5\*\* 7.38

D 76.39 344.5\*\* 245.12\*\*

E 321.51 99.38 F 420.89

B 74.99 345.9\*\* 246.52\*\* 1.4 5.98

Table 4-4. Multiple comparisons of the weed amount among treatments

Total 409666.4 17

Treatment

The soil moisture content of each treatment and analysis of variance of the soil moisture content were respectively shown in table 4-5 and table 4-6.



Table 4-5. The soil moisture content of each treatment

Table 4-6. Analysis of variance of the soil moisture content

Table 4-6 showed that there were significant differences among treatments. Multiple comparisons of the soil moisture content among treatments were shown in table 4-7.


Notes: The significance of symbols was as same as table 4-4.

Table 4-7. Multiple comparisons of the soil moisture content among treatments

The results showed that there were significant differences between three kinds of biogas residue fibre film, plastic film and control; there were significant differences between black film and control; there were significant differences between plastic film and black film. There were significant differences between A, C of biogas residue fibre film and black film;

plastic film.

**growth stages** 

the film had been degraded.

table 4-8.

0

5

10

15

Study on Manufacturing Technology and Performance of Biogas Residue Film 289

there were not significant differences between B of biogas residue fibre film and black film; there were not significant differences between three kinds of biogas residue fibre film and plastic film. It can be seen, soil moisture of biogas residue fibre film was significantly higher than control and black film, and there were not significant difference as compared with

**4.3.1 The effect of soil depth on soil temperature among treatments in different** 

**4.3.2 Effect of different treatments on total accumulated temperature** 

Table 4-8. The total accumulated temperature of each treatment

The soil temperatures that varied with soil depth of the six treatments were shown in Fig.4-2. Figure 4-2 showed that the mulching temperature was higher than the control during the whole growth period, the temperature of plastic film was the highest, the temperature of black film was higher than the biogas residue fibre film, and the temperature of A, B, C of the biogas residue fibre film was slightly higher than the control. It could be seen from the temperature curve of am7:00 and pm 14:00, soil temperature gradually decreased with the soil deepening, but, the temperature of soil surface decreased at pm 19:00, the soil temperature slightly increased with soil deepening in the stage of revival and flowering, and the soil temperature was constant in maturity; mulching had a certain warming effect in the stage of revival and flowering, and had not warming effect in maturity, the reason was that

The measured results of the total accumulated temperature of each treatment were shown in

Soil depth cm Interval\treatments A B C D E F

1 435.6 438.4 427.5 463.2 526.9 396.1 2 408.7 403.9 415.8 430 479.6 401.8 3 418.1 410.2 369.6 431.3 511.8 369.1 Mean 420.8 417.5 404.3 441.5 506.1 389

1 395 380.5 395.6 410 435.7 380.8 2 393.1 397.2 386.8 392.4 425.4 377.6 3 380.7 397.4 391.8 405.7 446.5 370.5 Mean 389.6 391.7 391.4 402.7 440.1 374.7

1 356.5 356 343.2 366.4 381.3 350.4 2 365.8 367.1 358.5 378.2 407.2 335.7 3 362.8 354.8 359.4 367.2 413 344.4 Mean 361.7 359.3 353.7 370.6 400.5 343.5

1 339.2 332.4 330.5 346.7 370.4 337.1 2 348.1 346 346.6 359.8 385.5 342.3 3 342.9 341.3 335.4 348.6 398.8 323.8 Mean 343.4 339.9 337.5 351.7 384.9 334.4

**4.3 The effect of different treatments on soil temperature** 

Fig. 4-2. The soil temperature that varied with soil depth of the six treatments

Fig. 4-2. The soil temperature that varied with soil depth of the six treatments

Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C Soil temperature/°C

there were not significant differences between B of biogas residue fibre film and black film; there were not significant differences between three kinds of biogas residue fibre film and plastic film. It can be seen, soil moisture of biogas residue fibre film was significantly higher than control and black film, and there were not significant difference as compared with plastic film.
